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CPC
E21F1/10
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Parent Industries
E
FIXED CONSTRUCTIONS
E21
Mining
E21F
SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
E21F1/00
Ventilation of mines or tunnels Distribution of ventilating currents
Current Industry
E21F1/10
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